NaceLookup

O(1) NACE Rev. 2.1 code lookup for .NET.

Maps 651 class codes (sections A–V) to human-readable descriptions and section names. Backed by a dictionary indexed by NACE code — thread-safe, zero-allocation after initialization, no external dependencies.

Install

dotnet add package NaceLookup

Usage

using Nace;

// Basic lookup
var result = NaceLookup.Get("64.19");
// result.Code        → "64.19"
// result.Description → "Other monetary intermediation"
// result.Section     → "L"
// result.SectionName → "Financial and Insurance Activities"

// Try-pattern
if (NaceLookup.TryGet("62.10", out var nace))
    Console.WriteLine(nace.Description); // "Computer programming activities"

// Get all codes in a section
var fintech = NaceLookup.GetBySection("L");

// Returns null for unknown codes, never throws
var unknown = NaceLookup.Get("99.99"); // null

// Flexible input formats
NaceLookup.Get("6419");  // same as "64.19"
NaceLookup.Get("01.11"); // standard format

// Total number of codes
Console.WriteLine(NaceLookup.Count); // 651

API

Method	Description
NaceLookup.Get(string code)	Returns NaceClass or null
NaceLookup.TryGet(string code, out NaceClass?)	Try-pattern lookup
NaceLookup.GetBySection(string section)	All classes in a section (e.g. "L")
NaceLookup.All	All 651 classes
NaceLookup.Count	Total number of classes (651)

NaceClass record:

Property	Type	Example
Code	string	"64.19"
Description	string	"Other monetary intermediation"
Section	string	"L"
SectionName	string	"Financial and Insurance Activities"

Sections

Section	Name
A	Agriculture, Forestry and Fishing
B	Mining and Quarrying
C	Manufacturing
D	Electricity, Gas, Steam and Air Conditioning Supply
E	Water Supply, Sewerage, Waste Management and Remediation
F	Construction
G	Wholesale and Retail Trade
H	Transportation and Storage
I	Accommodation and Food Service Activities
J	Publishing, Broadcasting and Content Production and Distribution
K	Telecommunication, Computer Programming, Consulting and Computing Infrastructure
L	Financial and Insurance Activities
M	Real Estate Activities
N	Professional, Scientific and Technical Activities
O	Administrative and Support Service Activities
P	Public Administration and Defence; Compulsory Social Security
Q	Education
R	Human Health and Social Work Activities
S	Arts, Sports and Recreation
T	Other Service Activities
U	Activities of Households as Employers
V	Activities of Extraterritorial Organisations and Bodies

Data source

The classification data is taken from:

NACE Rev. 2.1 – Statistical classification of economic activities in the European Union, 2025 edition. Published by Eurostat, European Commission. ISBN 978-92-68-13139-8 · doi:10.2785/155339 Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0). Source: ec.europa.eu/eurostat

This package covers all 651 four-digit classes from NACE Rev. 2.1 (the most recent revision as of 2025).

License

MIT